Alkali Swainsonpea – Sphaerophysa salsula IntroducedListed
Recorded in 3 of Oregon’s 36 counties. Oregon lists Alkali Swainsonpea under “B designated weed.”
Oregon noxious weeds
Oregon (OR) lists 126 plants as noxious weeds under OAR 603-052-1200. Oregon's list is an agricultural noxious-weed law, which governs control and spread on farmland and rights of way rather than what a nursery may sell.
What plants are invasive in Oregon?
Oregon names 126 plants, including Purple Loosestrife, Canada Thistle and Leafy Spurge. A noxious-weed listing obliges control and limits movement; it does not by itself ban nursery sale. 89 of the 126 are also flagged invasive by GRIIS, which is an ecological finding rather than a ruling by Oregon. Checked against OAR 603-052-1200 on July 20, 2026.
Atlantic Ivy – Hedera hibernica IntroducedInvasive
Invasive in the US, and recorded in 9 of Oregon’s 36 counties. Oregon lists Atlantic Ivy under “B designated weed.”
Barbed Goatgrass – Aegilops triuncialis IntroducedInvasive
Invasive in the US, and recorded in 1 of Oregon’s 36 counties. Oregon lists Barbed Goatgrass under “A designated weed.”
Biddy-Biddy – Acaena novae-zelandiae IntroducedListed
Recorded in 2 of Oregon’s 36 counties. Oregon lists Biddy-Biddy under “B designated weed.”
Blessed Milkthistle – Silybum marianum IntroducedInvasive
Invasive in the US, and recorded in 13 of Oregon’s 36 counties. Oregon lists Blessed Milkthistle under “B designated weed.”
Bohemian Knotweed – Polygonum x bohemicum Not recorded hereListed
Recorded in no Oregon county. Oregon lists Bohemian Knotweed under “B designated weed.”
Brazilian Waterweed – Egeria densa IntroducedInvasive
Invasive in the US, and recorded in 8 of Oregon’s 36 counties. Oregon lists Brazilian Waterweed under “B designated weed.”
Broadleaved Pepperweed – Lepidium latifolium IntroducedInvasive
Invasive in the US, and recorded in 13 of Oregon’s 36 counties. Oregon lists Broadleaved Pepperweed under “B designated weed.”
Bull Cottonthistle – Onopordum tauricum Not recorded hereListed
Recorded in no Oregon county. Oregon lists Bull Cottonthistle under “A designated weed.”
Bull Thistle – Cirsium vulgare IntroducedInvasive
Invasive in the US, and recorded in 35 of Oregon’s 36 counties. Oregon lists Bull Thistle under “B designated weed.”
Burningbush – Bassia scoparia IntroducedInvasive
Invasive in the US, and recorded in 12 of Oregon’s 36 counties. Oregon lists Burningbush under “B designated weed.”
Butter and Eggs – Linaria vulgaris IntroducedInvasive
Invasive in the US, and recorded in 26 of Oregon’s 36 counties. Oregon lists Butter and Eggs under “B designated weed.”
Butterfly Bush – Buddleja davidii IntroducedInvasive
Invasive in the US, and recorded in 6 of Oregon’s 36 counties. Oregon lists Butterfly Bush under “B designated weed.”
Camelthorn – Alhagi maurorum Not recorded hereInvasive
Invasive in the US, and recorded in no Oregon county. Oregon lists Camelthorn under “A designated weed.”
Canada Thistle – Cirsium arvense IntroducedInvasive
Invasive in the US, and recorded in 36 of Oregon’s 36 counties. Oregon lists Canada Thistle under “B designated weed.”
Cape-Ivy – Delairea odorata IntroducedInvasive
Invasive in the US, and recorded in 1 of Oregon’s 36 counties. Oregon lists Cape-Ivy under “A designated weed.”
Carelessweed – Amaranthus palmeri Not recorded hereListed
Recorded in no Oregon county. Oregon lists Carelessweed under “A designated weed.”
Coltsfoot – Tussilago farfara Not recorded hereInvasive
Invasive in the US, and recorded in no Oregon county. Oregon lists Coltsfoot under “A designated weed.”
Common Bugloss – Anchusa officinalis IntroducedListed
Recorded in 8 of Oregon’s 36 counties. Oregon lists Common Bugloss under “B designated weed.”
Common Cordgrass – Spartina anglica Not recorded hereListed
Recorded in no Oregon county. Oregon lists Common Cordgrass under “A designated weed.”
Common Crupina – Crupina vulgaris IntroducedInvasive
Invasive in the US, and recorded in 1 of Oregon’s 36 counties. Oregon lists Common Crupina under “B designated weed.”
Common Frogbit – Hydrocharis morsus-ranae Not recorded hereInvasive
Invasive in the US, and recorded in no Oregon county. Oregon lists Common Frogbit under “A designated weed.”
Common Gorse – Ulex europaeus IntroducedInvasive
Invasive in the US, and recorded in 13 of Oregon’s 36 counties. Oregon lists Common Gorse under “B designated weed.”
Common Reed – Phragmites australis NativeListed
Recorded in 13 of Oregon’s 36 counties. Oregon lists Common Reed under “B designated weed.”
Common St. Johnswort – Hypericum perforatum IntroducedInvasive
Invasive in the US, and recorded in 33 of Oregon’s 36 counties. Oregon lists Common St. Johnswort under “B designated weed.”
Common Viper's Bugloss – Echium vulgare IntroducedInvasive
Invasive in the US, and recorded in 3 of Oregon’s 36 counties. Oregon lists Common Viper's Bugloss under “B designated weed.”
Creeping Spurge – Euphorbia myrsinites IntroducedListed
Recorded in 11 of Oregon’s 36 counties. Oregon lists Creeping Spurge under “B designated weed.”
Cultivated Knotweed – Polygonum polystachyum IntroducedInvasive
Invasive in the US, and recorded in 7 of Oregon’s 36 counties. Oregon lists Cultivated Knotweed under “B designated weed.”
Cutleaf Teasel – Dipsacus laciniatus IntroducedInvasive
Invasive in the US, and recorded in 1 of Oregon’s 36 counties. Oregon lists Cutleaf Teasel under “B designated weed.”
Dalmatian Toadflax – Linaria dalmatica IntroducedInvasive
Invasive in the US, and recorded in 22 of Oregon’s 36 counties. Oregon lists Dalmatian Toadflax under “B designated weed.”
Delta Arrowhead – Sagittaria platyphylla Not recorded hereListed
Recorded in no Oregon county. Oregon lists Delta Arrowhead under “A designated weed.”
Denseflower Cordgrass – Spartina densiflora IntroducedListed
Recorded in 1 of Oregon’s 36 counties. Oregon lists Denseflower Cordgrass under “A designated weed.”
Diffuse Knapweed – Centaurea diffusa IntroducedInvasive
Invasive in the US, and recorded in 29 of Oregon’s 36 counties. Oregon lists Diffuse Knapweed under “B designated weed.”
Dog Rose – Rosa canina IntroducedInvasive
Invasive in the US, and recorded in 9 of Oregon’s 36 counties. Oregon lists Dog Rose under “B designated weed.”
Dyer's Woad – Isatis tinctoria IntroducedInvasive
Invasive in the US, and recorded in 9 of Oregon’s 36 counties. Oregon lists Dyer's Woad under “B designated weed.”
Eggleaf Spurge – Euphorbia oblongata IntroducedListed
Recorded in 1 of Oregon’s 36 counties. Oregon lists Eggleaf Spurge under “A designated weed.”
English Ivy – Hedera helix IntroducedInvasive
Invasive in the US, and recorded in 15 of Oregon’s 36 counties. Oregon lists English Ivy under “B designated weed.”
Eurasian Watermilfoil – Myriophyllum spicatum IntroducedInvasive
Invasive in the US, and recorded in 10 of Oregon’s 36 counties. Oregon lists Eurasian Watermilfoil under “B designated weed.”
Evergreen Clematis – Clematis vitalba IntroducedInvasive
Invasive in the US, and recorded in 8 of Oregon’s 36 counties. Oregon lists Evergreen Clematis under “B designated weed.”
False Indigobush – Amorpha fruticosa NativeListed
Recorded in 11 of Oregon’s 36 counties. Oregon lists False Indigobush under “B designated weed.”
Field Bindweed – Convolvulus arvensis IntroducedInvasive
Invasive in the US, and recorded in 30 of Oregon’s 36 counties. Oregon lists Field Bindweed under “B designated weed.”
Fig Buttercup – Ranunculus ficaria IntroducedInvasive
Invasive in the US, and recorded in 5 of Oregon’s 36 counties. Oregon lists Fig Buttercup under “B designated weed.”
Floating Primrose-Willow – Ludwigia peploides NativeListed
Recorded in 1 of Oregon’s 36 counties. Oregon lists Floating Primrose-Willow under “B designated weed.”
Flowering Rush – Butomus umbellatus Not recorded hereInvasive
Invasive in the US, and recorded in no Oregon county. Oregon lists Flowering Rush under “A designated weed.”
French Broom – Genista monspessulana IntroducedInvasive
Invasive in the US, and recorded in 7 of Oregon’s 36 counties. Oregon lists French Broom under “B designated weed.”
Garden Yellow Loosestrife – Lysimachia vulgaris IntroducedInvasive
Invasive in the US, and recorded in 1 of Oregon’s 36 counties. Oregon lists Garden Yellow Loosestrife under “A designated weed.”
Garlic Mustard – Alliaria petiolata IntroducedInvasive
Invasive in the US, and recorded in 3 of Oregon’s 36 counties. Oregon lists Garlic Mustard under “B designated weed.”
Giant Hogweed – Heracleum mantegazzianum IntroducedInvasive
Invasive in the US, and recorded in 5 of Oregon’s 36 counties. Oregon lists Giant Hogweed under “A designated weed.”
Giant Knotweed – Polygonum sachalinense IntroducedInvasive
Invasive in the US, and recorded in 12 of Oregon’s 36 counties. Oregon lists Giant Knotweed under “B designated weed.”
Giant Reed – Arundo donax Not recorded hereInvasive
Invasive in the US, and recorded in no Oregon county. Oregon lists Giant Reed under “B designated weed.”
Gypsyflower – Cynoglossum officinale IntroducedInvasive
Invasive in the US, and recorded in 19 of Oregon’s 36 counties. Oregon lists Gypsyflower under “B designated weed.”
Hardheads – Acroptilon repens IntroducedInvasive
Invasive in the US, and recorded in 19 of Oregon’s 36 counties. Oregon lists Hardheads under “B designated weed.”
Harmal Peganum – Peganum harmala IntroducedInvasive
Invasive in the US, and recorded in 1 of Oregon’s 36 counties. Oregon lists Harmal Peganum under “A designated weed.”
Himalayan Blackberry – Rubus armeniacus IntroducedListed
Recorded in 23 of Oregon’s 36 counties. Oregon lists Himalayan Blackberry under “B designated weed.”
Hoary Alyssum – Berteroa incana IntroducedInvasive
Invasive in the US, and recorded in 1 of Oregon’s 36 counties. Oregon lists Hoary Alyssum under “A designated weed.”
Iberian Knapweed – Centaurea iberica IntroducedListed
Recorded in 1 of Oregon’s 36 counties. Oregon lists Iberian Knapweed under “A designated weed.”
Italian Plumeless Thistle – Carduus pycnocephalus IntroducedInvasive
Invasive in the US, and recorded in 5 of Oregon’s 36 counties. Oregon lists Italian Plumeless Thistle under “B designated weed.”
Japanese Dodder – Cuscuta japonica Not recorded hereListed
Recorded in no Oregon county. Oregon lists Japanese Dodder under “A designated weed.”
Japanese Knotweed – Fallopia japonica (potentially invasive weed) IntroducedInvasive
Invasive in the US, and recorded in 10 of Oregon’s 36 counties. Oregon lists Japanese Knotweed under “B designated weed.”
Jointed Goatgrass – Aegilops cylindrica IntroducedInvasive
Invasive in the US, and recorded in 5 of Oregon’s 36 counties. Oregon lists Jointed Goatgrass under “B designated weed.”
Large-Flower Primrose-Willow – Ludwigia grandiflora subsp. hexapetala IntroducedListed
Recorded in 3 of Oregon’s 36 counties. Oregon lists Large-Flower Primrose-Willow under “B designated weed.”
Large-Flower Primrose-Willow – Ludwigia grandiflora IntroducedInvasive
Invasive in the US, and recorded in 4 of Oregon’s 36 counties. Oregon lists Large-Flower Primrose-Willow under “B designated weed.”
Leafy Spurge – Euphorbia esula IntroducedInvasive
Invasive in the US, and recorded in 13 of Oregon’s 36 counties. Oregon lists Leafy Spurge under “B designated weed.”
Matgrass – Nardus stricta IntroducedInvasive
Invasive in the US, and recorded in 2 of Oregon’s 36 counties. Oregon lists Matgrass under “A designated weed.”
Meadow Hawkweed – Hieracium caespitosum IntroducedInvasive
Invasive in the US, and recorded in 1 of Oregon’s 36 counties. Oregon lists Meadow Hawkweed under “B designated weed.”
Mediterranean Sage – Salvia aethiopis IntroducedInvasive
Invasive in the US, and recorded in 11 of Oregon’s 36 counties. Oregon lists Mediterranean Sage under “B designated weed.”
Medusahead – Taeniatherum caput-medusae IntroducedInvasive
Invasive in the US, and recorded in 22 of Oregon’s 36 counties. Oregon lists Medusahead under “B designated weed.”
Mouseear Hawkweed – Hieracium pilosella IntroducedInvasive
Invasive in the US, and recorded in 2 of Oregon’s 36 counties. Oregon lists Mouseear Hawkweed under “A designated weed.”
Nodding Plumeless Thistle – Carduus nutans IntroducedInvasive
Invasive in the US, and recorded in 16 of Oregon’s 36 counties. Oregon lists Nodding Plumeless Thistle under “B designated weed.”
North Africa Grass – Ventenata dubia IntroducedInvasive
Invasive in the US, and recorded in 14 of Oregon’s 36 counties. Oregon lists North Africa Grass under “B designated weed.”
Nutgrass – Cyperus rotundus IntroducedInvasive
Invasive in the US, and recorded in 1 of Oregon’s 36 counties. Oregon lists Nutgrass under “A designated weed.”
Oneseed Hawthorn – Crataegus monogyna IntroducedInvasive
Invasive in the US, and recorded in 15 of Oregon’s 36 counties. Oregon lists Oneseed Hawthorn under “B designated weed.”
Orange Hawkweed – Hieracium aurantiacum IntroducedInvasive
Invasive in the US, and recorded in 5 of Oregon’s 36 counties. Oregon lists Orange Hawkweed under “A designated weed.”
Ornamental Jewelweed – Impatiens glandulifera IntroducedInvasive
Invasive in the US, and recorded in 6 of Oregon’s 36 counties. Oregon lists Ornamental Jewelweed under “B designated weed.”
Ovate Goatgrass – Aegilops geniculata Not recorded hereListed
Recorded in no Oregon county. Oregon lists Ovate Goatgrass under “A designated weed.”
Paleyellow Iris – Iris pseudacorus IntroducedInvasive
Invasive in the US, and recorded in 10 of Oregon’s 36 counties. Oregon lists Paleyellow Iris under “B designated weed.”
Parrot Feather Watermilfoil – Myriophyllum aquaticum IntroducedInvasive
Invasive in the US, and recorded in 11 of Oregon’s 36 counties. Oregon lists Parrot Feather Watermilfoil under “B designated weed.”
Perennial Pea – Lathyrus latifolius IntroducedInvasive
Invasive in the US, and recorded in 17 of Oregon’s 36 counties. Oregon lists Perennial Pea under “B designated weed.”
Plume Grass – Saccharum ravennae (Erianthus ravennae) Not recorded hereListed
Recorded in no Oregon county. Oregon lists Plume Grass under “A designated weed.”
Poison Hemlock – Conium maculatum IntroducedInvasive
Invasive in the US, and recorded in 24 of Oregon’s 36 counties. Oregon lists Poison Hemlock under “B designated weed.”
Pride of Teneriffe – Echium pininana Not recorded hereListed
Recorded in no Oregon county. Oregon lists Pride of Teneriffe under “B designated weed.”
Professor-Weed – Galega officinalis Not recorded hereInvasive
Invasive in the US, and recorded in no Oregon county. Oregon lists Professor-Weed under “A designated weed.”
Puncturevine – Tribulus terrestris IntroducedInvasive
Invasive in the US, and recorded in 20 of Oregon’s 36 counties. Oregon lists Puncturevine under “B designated weed.”
Purple Loosestrife – Lythrum salicaria IntroducedInvasive
Invasive in the US, and recorded in 29 of Oregon’s 36 counties. Oregon lists Purple Loosestrife under “B designated weed.”
Purple Pampas Grass – Cortaderia jubata IntroducedInvasive
Invasive in the US, and recorded in 3 of Oregon’s 36 counties. Oregon lists Purple Pampas Grass under “B designated weed.”
Red Star-Thistle – Centaurea calcitrapa IntroducedInvasive
Invasive in the US, and recorded in 3 of Oregon’s 36 counties. Oregon lists Red Star-Thistle under “A designated weed.”
Reed Canarygrass – Phalaris arundinacea NativeListed
Recorded in 32 of Oregon’s 36 counties. Oregon lists Reed Canarygrass under “B designated weed.”
Robert Geranium – Geranium robertianum NativeListed
Recorded in 11 of Oregon’s 36 counties. Oregon lists Robert Geranium under “B designated weed.”
Rush Skeletonweed – Chondrilla juncea IntroducedInvasive
Invasive in the US, and recorded in 17 of Oregon’s 36 counties. Oregon lists Rush Skeletonweed under “B designated weed.”
Saltcedar – Tamarix ramosissima Not recorded hereInvasive
Invasive in the US, and recorded in no Oregon county. Oregon lists Saltcedar under “B designated weed.”
Saltlover – Halogeton glomeratus IntroducedInvasive
Invasive in the US, and recorded in 3 of Oregon’s 36 counties. Oregon lists Saltlover under “B designated weed.”
Saltmeadow Cordgrass – Spartina patens NativeListed
Recorded in 1 of Oregon’s 36 counties. Oregon lists Saltmeadow Cordgrass under “A designated weed.”
Salvation Jane – Echium plantagineum IntroducedInvasive
Invasive in the US, and recorded in 1 of Oregon’s 36 counties. Oregon lists Salvation Jane under “A designated weed.”
Scotch Broom – Cytisus scoparius IntroducedInvasive
Invasive in the US, and recorded in 21 of Oregon’s 36 counties. Oregon lists Scotch Broom under “B designated weed.”
Scotch Cottonthistle – Onopordum acanthium IntroducedInvasive
Invasive in the US, and recorded in 20 of Oregon’s 36 counties. Oregon lists Scotch Cottonthistle under “B designated weed.”
Shining Geranium – Geranium lucidum IntroducedListed
Recorded in 8 of Oregon’s 36 counties. Oregon lists Shining Geranium under “B designated weed.”
Slender False Brome – Brachypodium sylvaticum IntroducedInvasive
Invasive in the US, and recorded in 5 of Oregon’s 36 counties. Oregon lists Slender False Brome under “B designated weed.”
Smooth Cordgrass – Spartina alterniflora NativeListed
Recorded in 2 of Oregon’s 36 counties. Oregon lists Smooth Cordgrass under “A designated weed.”
Spanish Broom – Spartium junceum IntroducedInvasive
Invasive in the US, and recorded in 5 of Oregon’s 36 counties. Oregon lists Spanish Broom under “B designated weed.”
Spanish Heath – Erica lusitanica Not recorded hereInvasive
Invasive in the US, and recorded in no Oregon county. Oregon lists Spanish Heath under “B designated weed.”
Spiny Plumeless Thistle – Carduus acanthoides Not recorded hereInvasive
Invasive in the US, and recorded in no Oregon county. Oregon lists Spiny Plumeless Thistle under “A designated weed.”
Spotted Knapweed – Centaurea stoebe IntroducedInvasive
Invasive in the US, and recorded in 29 of Oregon’s 36 counties. Oregon lists Spotted Knapweed under “B designated weed.”
Spurgelaurel – Daphne laureola IntroducedListed
Recorded in 3 of Oregon’s 36 counties. Oregon lists Spurgelaurel under “B designated weed.”
Squarrose Knapweed – Centaurea virgata IntroducedListed
Recorded in 5 of Oregon’s 36 counties. Oregon lists Squarrose Knapweed under “A designated weed.”
Stinking Willie – Senecio jacobaea IntroducedInvasive
Invasive in the US, and recorded in 27 of Oregon’s 36 counties. Oregon lists Stinking Willie under “B designated weed.”
Striated Broom – Cytisus striatus IntroducedInvasive
Invasive in the US, and recorded in 2 of Oregon’s 36 counties. Oregon lists Striated Broom under “B designated weed.”
Sulphur Cinquefoil – Potentilla recta IntroducedInvasive
Invasive in the US, and recorded in 9 of Oregon’s 36 counties. Oregon lists Sulphur Cinquefoil under “B designated weed.”
Summer Pheasant's Eye – Adonis aestivalis IntroducedListed
Recorded in 4 of Oregon’s 36 counties. Oregon lists Summer Pheasant's Eye under “B designated weed.”
Sweet Briar Rose – Rosa rubiginosa (R.eglanteria) IntroducedInvasive
Invasive in the US, and recorded in 19 of Oregon’s 36 counties. Oregon lists Sweet Briar Rose under “B designated weed.”
Tall Hawkweed – Hieracium piloselloides Not recorded hereInvasive
Invasive in the US, and recorded in no Oregon county. Oregon lists Tall Hawkweed under “A designated weed.”
Tree of Heaven – Ailanthus altissima IntroducedInvasive
Invasive in the US, and recorded in 13 of Oregon’s 36 counties. Oregon lists Tree of Heaven under “B designated weed.”
Tyrol Knapweed – Centaurea nigrescens IntroducedListed
Recorded in 14 of Oregon’s 36 counties. Oregon lists Tyrol Knapweed under “B designated weed.”
Upright Pepperweed – Lepidium strictum NativeListed
Recorded in 3 of Oregon’s 36 counties. Oregon lists Upright Pepperweed under “B designated weed.”
Water Chestnut – Trapa natans Not recorded hereInvasive
Invasive in the US, and recorded in no Oregon county. Oregon lists Water Chestnut under “A designated weed.”
Water Soldiers – Stratiotes aloides Not recorded hereListed
Recorded in no Oregon county. Oregon lists Water Soldiers under “A designated weed.”
Waterthyme – Hydrilla verticillata Not recorded hereInvasive
Invasive in the US, and recorded in no Oregon county. Oregon lists Waterthyme under “A designated weed.”
West Indian Spongeplant – Limnobium laevigatum Not recorded hereListed
Recorded in no Oregon county. Oregon lists West Indian Spongeplant under “A designated weed.”
White Bryony – Bryonia alba Not recorded hereInvasive
Invasive in the US, and recorded in no Oregon county. Oregon lists White Bryony under “A designated weed.”
Winged Plumeless Thistle – Carduus tenuiflorus IntroducedListed
Recorded in 4 of Oregon’s 36 counties. Oregon lists Winged Plumeless Thistle under “B designated weed.”
Woolly Distaff Thistle – Carthamus lanatus subsp. creticus IntroducedListed
Recorded in 3 of Oregon’s 36 counties. Oregon lists Woolly Distaff Thistle under “A designated weed.”
Woolly Distaff Thistle – Carthamus lanatus IntroducedInvasive
Invasive in the US, and recorded in 3 of Oregon’s 36 counties. Oregon lists Woolly Distaff Thistle under “A designated weed.”
Yellow Archangel – Lamiastrum galeobdolon Not recorded hereInvasive
Invasive in the US, and recorded in no Oregon county. Oregon lists Yellow Archangel under “B designated weed.”
Yellow Floatingheart – Nymphoides peltata Not recorded hereInvasive
Invasive in the US, and recorded in no Oregon county. Oregon lists Yellow Floatingheart under “A designated weed.”
Yellow Nutsedge – Cyperus esculentus NativeListed
Recorded in 10 of Oregon’s 36 counties. Oregon lists Yellow Nutsedge under “B designated weed.”
Yellow Star-Thistle – Centaurea solstitialis IntroducedInvasive
Invasive in the US, and recorded in 26 of Oregon’s 36 counties. Oregon lists Yellow Star-Thistle under “B designated weed.”
Yellowtuft – Alyssum murale IntroducedListed
Recorded in 1 of Oregon’s 36 counties. Oregon lists Yellowtuft under “A designated weed.”
No plant on Oregon’s list matches that.
7 of these plants are native to part of the United States, marked US native above. Nativity is regional. Black locust is native to the Appalachians and regulated in New England; Palmer amaranth is native to the Southwest and listed as an agricultural weed in the Corn Belt. A listing tells you what Oregon regulates, not where a plant belongs. The county checker answers the second question.
Want to check a plant by photo or county?
Use our “Is it native” tool for free.Compiled from the rule itself, retrieved July 20, 2026. Law changes; if you spot a listing we have wrong or stale, tell us at support@getezina.com.
The same list as a table
| Plant | Scientific name | Status | Plant instead |
|---|---|---|---|
| Alkali Swainsonpea | Sphaerophysa salsula | ListedOregon says “B designated weed” | — |
| Atlantic Ivy | Hedera hibernica | ListedInvasiveOregon says “B designated weed” | — |
| Barbed Goatgrass | Aegilops triuncialis | ListedInvasiveOregon says “A designated weed” | — |
| Biddy-Biddy | Acaena novae-zelandiae | ListedOregon says “B designated weed” | — |
| Blessed Milkthistle | Silybum marianum | ListedInvasiveOregon says “B designated weed” | — |
| Bohemian Knotweed | Polygonum x bohemicum | ListedOregon says “B designated weed” | — |
| Brazilian Waterweed | Egeria densa | ListedInvasiveOregon says “B designated weed” | — |
| Broadleaved Pepperweed | Lepidium latifolium | ListedInvasiveOregon says “B designated weed” | — |
| Bull Cottonthistle | Onopordum tauricum | ListedOregon says “A designated weed” | — |
| Bull Thistle | Cirsium vulgare | ListedInvasiveOregon says “B designated weed” | — |
| Burningbush | Bassia scoparia | ListedInvasiveOregon says “B designated weed” | — |
| Butter and Eggs | Linaria vulgaris | ListedInvasiveOregon says “B designated weed” | — |
| Butterfly Bush | Buddleja davidii | ListedInvasiveOregon says “B designated weed” | — |
| Camelthorn | Alhagi maurorum | ListedInvasiveOregon says “A designated weed” | — |
| Canada Thistle | Cirsium arvense | ListedInvasiveOregon says “B designated weed” | — |
| Cape-Ivy | Delairea odorata | ListedInvasiveOregon says “A designated weed” | — |
| Carelessweed US native | Amaranthus palmeri | ListedOregon says “A designated weed” | — |
| Coltsfoot | Tussilago farfara | ListedInvasiveOregon says “A designated weed” | Fiddleleaf Hawksbeard, California Damsonium, White Marsh Marigold |
| Common Bugloss | Anchusa officinalis | ListedOregon says “B designated weed” | — |
| Common Cordgrass | Spartina anglica | ListedOregon says “A designated weed” | — |
| Common Crupina | Crupina vulgaris | ListedInvasiveOregon says “B designated weed” | — |
| Common Frogbit | Hydrocharis morsus-ranae | ListedInvasiveOregon says “A designated weed” | — |
| Common Gorse | Ulex europaeus | ListedInvasiveOregon says “B designated weed” | — |
| Common Reed | Phragmites australis | ListedOregon says “B designated weed” | — |
| Common St. Johnswort | Hypericum perforatum | ListedInvasiveOregon says “B designated weed” | — |
| Common Viper's Bugloss | Echium vulgare | ListedInvasiveOregon says “B designated weed” | — |
| Creeping Spurge | Euphorbia myrsinites | ListedOregon says “B designated weed” | — |
| Cultivated Knotweed | Polygonum polystachyum | ListedInvasiveOregon says “B designated weed” | — |
| Cutleaf Teasel | Dipsacus laciniatus | ListedInvasiveOregon says “B designated weed” | — |
| Dalmatian Toadflax | Linaria dalmatica | ListedInvasiveOregon says “B designated weed” | — |
| Delta Arrowhead US native | Sagittaria platyphylla | ListedOregon says “A designated weed” | — |
| Denseflower Cordgrass | Spartina densiflora | ListedOregon says “A designated weed” | — |
| Diffuse Knapweed | Centaurea diffusa | ListedInvasiveOregon says “B designated weed” | — |
| Dog Rose | Rosa canina | ListedInvasiveOregon says “B designated weed” | — |
| Dyer's Woad | Isatis tinctoria | ListedInvasiveOregon says “B designated weed” | — |
| Eggleaf Spurge | Euphorbia oblongata | ListedOregon says “A designated weed” | — |
| English Ivy | Hedera helix | ListedInvasiveOregon says “B designated weed” | — |
| Eurasian Watermilfoil | Myriophyllum spicatum | ListedInvasiveOregon says “B designated weed” | — |
| Evergreen Clematis | Clematis vitalba | ListedInvasiveOregon says “B designated weed” | — |
| False Indigobush US native | Amorpha fruticosa | ListedOregon says “B designated weed” | — |
| Field Bindweed | Convolvulus arvensis | ListedInvasiveOregon says “B designated weed” | — |
| Fig Buttercup | Ranunculus ficaria | ListedInvasiveOregon says “B designated weed” | Plantainleaf Buttercup, Alkali Buttercup, Sagebrush Buttercup |
| Floating Primrose-Willow | Ludwigia peploides | ListedOregon says “B designated weed” | — |
| Flowering Rush | Butomus umbellatus | ListedInvasiveOregon says “A designated weed” | — |
| French Broom | Genista monspessulana | ListedInvasiveOregon says “B designated weed” | — |
| Garden Yellow Loosestrife | Lysimachia vulgaris | ListedInvasiveOregon says “A designated weed” | — |
| Garlic Mustard | Alliaria petiolata | ListedInvasiveOregon says “B designated weed” | — |
| Giant Hogweed | Heracleum mantegazzianum | ListedInvasiveOregon says “A designated weed” | — |
| Giant Knotweed | Polygonum sachalinense | ListedInvasiveOregon says “B designated weed” | — |
| Giant Reed | Arundo donax | ListedInvasiveOregon says “B designated weed” | — |
| Gypsyflower | Cynoglossum officinale | ListedInvasiveOregon says “B designated weed” | — |
| Hardheads | Acroptilon repens | ListedInvasiveOregon says “B designated weed” | — |
| Harmal Peganum | Peganum harmala | ListedInvasiveOregon says “A designated weed” | — |
| Himalayan Blackberry | Rubus armeniacus | ListedOregon says “B designated weed” | — |
| Hoary Alyssum | Berteroa incana | ListedInvasiveOregon says “A designated weed” | — |
| Iberian Knapweed | Centaurea iberica | ListedOregon says “A designated weed” | — |
| Italian Plumeless Thistle | Carduus pycnocephalus | ListedInvasiveOregon says “B designated weed” | — |
| Japanese Dodder | Cuscuta japonica | ListedOregon says “A designated weed” | — |
| Japanese Knotweed | Fallopia japonica (potentially invasive weed) | ListedInvasiveOregon says “B designated weed” | — |
| Jointed Goatgrass | Aegilops cylindrica | ListedInvasiveOregon says “B designated weed” | — |
| Large-Flower Primrose-Willow | Ludwigia grandiflora subsp. hexapetala | ListedOregon says “B designated weed” | — |
| Large-Flower Primrose-Willow | Ludwigia grandiflora | ListedInvasiveOregon says “B designated weed” | — |
| Leafy Spurge | Euphorbia esula | ListedInvasiveOregon says “B designated weed” | — |
| Matgrass | Nardus stricta | ListedInvasiveOregon says “A designated weed” | — |
| Meadow Hawkweed | Hieracium caespitosum | ListedInvasiveOregon says “B designated weed” | — |
| Mediterranean Sage | Salvia aethiopis | ListedInvasiveOregon says “B designated weed” | — |
| Medusahead | Taeniatherum caput-medusae | ListedInvasiveOregon says “B designated weed” | — |
| Mouseear Hawkweed | Hieracium pilosella | ListedInvasiveOregon says “A designated weed” | — |
| Nodding Plumeless Thistle | Carduus nutans | ListedInvasiveOregon says “B designated weed” | — |
| North Africa Grass | Ventenata dubia | ListedInvasiveOregon says “B designated weed” | — |
| Nutgrass | Cyperus rotundus | ListedInvasiveOregon says “A designated weed” | — |
| Oneseed Hawthorn | Crataegus monogyna | ListedInvasiveOregon says “B designated weed” | — |
| Orange Hawkweed | Hieracium aurantiacum | ListedInvasiveOregon says “A designated weed” | — |
| Ornamental Jewelweed | Impatiens glandulifera | ListedInvasiveOregon says “B designated weed” | — |
| Ovate Goatgrass | Aegilops geniculata | ListedOregon says “A designated weed” | — |
| Paleyellow Iris | Iris pseudacorus | ListedInvasiveOregon says “B designated weed” | Rocky Mountain Pond-Lily, Pickerelweed, Pennsylvania Smartweed |
| Parrot Feather Watermilfoil | Myriophyllum aquaticum | ListedInvasiveOregon says “B designated weed” | — |
| Perennial Pea | Lathyrus latifolius | ListedInvasiveOregon says “B designated weed” | — |
| Plume Grass | Saccharum ravennae (Erianthus ravennae) | ListedOregon says “A designated weed” | — |
| Poison Hemlock | Conium maculatum | ListedInvasiveOregon says “B designated weed” | — |
| Pride of Teneriffe | Echium pininana | ListedOregon says “B designated weed” | — |
| Professor-Weed | Galega officinalis | ListedInvasiveOregon says “A designated weed” | — |
| Puncturevine | Tribulus terrestris | ListedInvasiveOregon says “B designated weed” | — |
| Purple Loosestrife | Lythrum salicaria | ListedInvasiveOregon says “B designated weed” | Canada Goldenrod, Cutleaf Waterparsnip, Common Cowparsnip |
| Purple Pampas Grass | Cortaderia jubata | ListedInvasiveOregon says “B designated weed” | — |
| Red Star-Thistle | Centaurea calcitrapa | ListedInvasiveOregon says “A designated weed” | — |
| Reed Canarygrass US native | Phalaris arundinacea | ListedOregon says “B designated weed” | Common Rush, Drooping Woodreed, Woolgrass |
| Robert Geranium | Geranium robertianum | ListedOregon says “B designated weed” | — |
| Rush Skeletonweed | Chondrilla juncea | ListedInvasiveOregon says “B designated weed” | — |
| Saltcedar | Tamarix ramosissima | ListedInvasiveOregon says “B designated weed” | — |
| Saltlover | Halogeton glomeratus | ListedInvasiveOregon says “B designated weed” | — |
| Saltmeadow Cordgrass US native | Spartina patens | ListedOregon says “A designated weed” | — |
| Salvation Jane | Echium plantagineum | ListedInvasiveOregon says “A designated weed” | — |
| Scotch Broom | Cytisus scoparius | ListedInvasiveOregon says “B designated weed” | Mallow Ninebark, Sticky Currant, Coastal Bush Lupine |
| Scotch Cottonthistle | Onopordum acanthium | ListedInvasiveOregon says “B designated weed” | — |
| Shining Geranium | Geranium lucidum | ListedOregon says “B designated weed” | — |
| Slender False Brome | Brachypodium sylvaticum | ListedInvasiveOregon says “B designated weed” | — |
| Smooth Cordgrass US native | Spartina alterniflora | ListedOregon says “A designated weed” | — |
| Spanish Broom | Spartium junceum | ListedInvasiveOregon says “B designated weed” | — |
| Spanish Heath | Erica lusitanica | ListedInvasiveOregon says “B designated weed” | — |
| Spiny Plumeless Thistle | Carduus acanthoides | ListedInvasiveOregon says “A designated weed” | — |
| Spotted Knapweed | Centaurea stoebe | ListedInvasiveOregon says “B designated weed” | — |
| Spurgelaurel | Daphne laureola | ListedOregon says “B designated weed” | — |
| Squarrose Knapweed | Centaurea virgata | ListedOregon says “A designated weed” | — |
| Stinking Willie | Senecio jacobaea | ListedInvasiveOregon says “B designated weed” | — |
| Striated Broom | Cytisus striatus | ListedInvasiveOregon says “B designated weed” | — |
| Sulphur Cinquefoil | Potentilla recta | ListedInvasiveOregon says “B designated weed” | — |
| Summer Pheasant's Eye | Adonis aestivalis | ListedOregon says “B designated weed” | — |
| Sweet Briar Rose | Rosa rubiginosa (R.eglanteria) | ListedInvasiveOregon says “B designated weed” | — |
| Tall Hawkweed | Hieracium piloselloides | ListedInvasiveOregon says “A designated weed” | — |
| Tree of Heaven | Ailanthus altissima | ListedInvasiveOregon says “B designated weed” | California Black Oak, Osage-Orange, Quaking Aspen |
| Tyrol Knapweed | Centaurea nigrescens | ListedOregon says “B designated weed” | — |
| Upright Pepperweed US native | Lepidium strictum | ListedOregon says “B designated weed” | — |
| Water Chestnut | Trapa natans | ListedInvasiveOregon says “A designated weed” | — |
| Water Soldiers | Stratiotes aloides | ListedOregon says “A designated weed” | — |
| Waterthyme | Hydrilla verticillata | ListedInvasiveOregon says “A designated weed” | — |
| West Indian Spongeplant | Limnobium laevigatum | ListedOregon says “A designated weed” | — |
| White Bryony | Bryonia alba | ListedInvasiveOregon says “A designated weed” | — |
| Winged Plumeless Thistle | Carduus tenuiflorus | ListedOregon says “B designated weed” | — |
| Woolly Distaff Thistle | Carthamus lanatus subsp. creticus | ListedOregon says “A designated weed” | — |
| Woolly Distaff Thistle | Carthamus lanatus | ListedInvasiveOregon says “A designated weed” | — |
| Yellow Archangel | Lamiastrum galeobdolon | ListedInvasiveOregon says “B designated weed” | — |
| Yellow Floatingheart | Nymphoides peltata | ListedInvasiveOregon says “A designated weed” | — |
| Yellow Nutsedge | Cyperus esculentus | ListedOregon says “B designated weed” | — |
| Yellow Star-Thistle | Centaurea solstitialis | ListedInvasiveOregon says “B designated weed” | — |
| Yellowtuft | Alyssum murale | ListedOregon says “A designated weed” | — |
Where this comes from
- Oregon listings
- OAR 603-052-1200. Read the rule.
- Invasive status
- GRIIS, the Global Register of Introduced and Invasive Species, via GBIF, covering the lower 48 states. A scientific register with no legal force; it is cited separately from the statute above because the two disagree far more often than they agree. Garden crops it flags only for spreading from cultivation are left out after review.
- Status wording
- The Prohibited / Restricted / Listed chips are Ezina’s normalisation across 44 states and are not the legal term. Where Oregon’s own word for a plant differs from the chip, it is quoted verbatim beneath it.
- Nativity
- USDA PLANTS county distribution layer, surfaced through the county checker.
Regulated next door, but not in Oregon
Plants that two or more states bordering Oregon regulate, and Oregon does not. A listing is a legal act rather than an ecological one, so a plant can be a documented problem here and still be sold here.
- Black Henbane Hyoscyamus niger regulated in California, Idaho, Nevada, Washington
- Field Sowthistle Sonchus arvensis regulated in California, Idaho, Nevada, Washington
- Syrian Beancaper Zygophyllum fabago regulated in California, Idaho, Nevada, Washington
- Austrian Yellowcress Rorippa austriaca regulated in California, Nevada, Washington
- Carolina Fanwort Cabomba caroliniana regulated in California, Idaho, Washington
- Curly Pondweed Potamogeton crispus regulated in Idaho, Nevada, Washington
- Johnsongrass Sorghum halepense regulated in Idaho, Nevada, Washington
- Maltese Star-Thistle Centaurea melitensis regulated in California, Nevada, Washington
- Silverleaf Nightshade Solanum elaeagnifolium regulated in California, Nevada, Washington
- American Spongeplant Limnobium spongia regulated in California, Washington
- Carolina Horsenettle Solanum carolinense regulated in California, Nevada
- Dwarf Eelgrass Nanozostera japonica regulated in California, Washington
- European Wand Loosestrife Lythrum virgatum regulated in Nevada, Washington
- Hairy Whitetop Cardaria pubescens regulated in California, Washington
- Kariba-Weed Salvinia molesta regulated in Idaho, Nevada
Questions
Is there an official Oregon invasive species list?
Not under that name. Oregon's legal list is a noxious-weed list: 126 plants named under OAR 603-052-1200, an agricultural noxious-weed law, which governs control and spread on farmland and rights of way rather than what a nursery may sell. GRIIS, the Global Register of Introduced and Invasive Species, flags 89 of these 126 as invasive in the lower 48 states. That is an ecological finding, not a ruling by Oregon. This page shows both side by side.
What plants are illegal to sell in Oregon?
Oregon's list is an agricultural noxious-weed law, which governs control and spread on farmland and rights of way rather than what a nursery may sell. 126 plants are named under OAR 603-052-1200. A noxious-weed listing does not automatically ban nursery sale, so check the rule itself before assuming a plant cannot be bought or sold.
Is my plant invasive in Oregon?
Search the table on this page for Oregon's legal determination, then look for the Invasive chip beside it, which is a separate ecological finding from GRIIS rather than a ruling by Oregon. A plant can carry one, both, or neither. For an address-level answer, enter the plant's name in Ezina's checker to get its Oregon status alongside whether USDA records it as native to your specific county. Every answer links the record it came from.
Is it illegal to plant these in Oregon?
Not necessarily, and the distinction matters. Oregon's list is an agricultural noxious-weed law: it obliges landowners to control these plants and restricts moving them, rather than making the act of planting one an offence in itself. OAR 603-052-1200 is the text that says what is actually required of you, and it is linked beside every plant here.
Does a plant missing from this list mean it is safe to plant in Oregon?
No. This page reproduces what Oregon regulates, and a state list is a legal instrument rather than an ecological verdict. Plenty of plants spread aggressively without ever being listed, and states add species years after the problem is documented.
Grow natives easily with Ezina
How it works
We provide the tools you need to succeed.
010.1Identify
Add a plant
Snap a photo or type the name. Ezina matches it to a library of about 40,000 species and starts a care plan tailored to your zone, the local weather, and the time of year.
010.2Care
Get a care plan
A schedule built from local rain, temperature, and sun, not a fixed weekly cadence. You get a single notification when a plant actually needs water. Easily add treatments for diseases and pests.
010.3Plan
Explore new options
Our garden planner Dig helps you understand what works best for your location and makes suggestions based off your long term goals.
Add a plant
Snap a photo or type the name. Ezina matches it to a library of about 40,000 species and starts a care plan tailored to your zone, the local weather, and the time of year.
Get a care plan
A schedule built from local rain, temperature, and sun, not a fixed weekly cadence. You get a single notification when a plant actually needs water. Easily add treatments for diseases and pests.
Explore new options
Our garden planner Dig helps you understand what works best for your location and makes suggestions based off your long term goals.
Compiled from peer-reviewed research, USDA documentation,
and direct scientific observation across the United States.